Variation of relative cell stiffness, k1/k2, and relative resting cell length, a1/a2, in a model with two adjacent tissues and a constant density initial condition. (a) Characteristics of the interface position for varying k1/k2. The right tissue has fixed cell stiffness k2 = 1 while the left tissue cell stiffness is varied. (b) Characteristics of the interface particle for varying a1/a2. The right tissue has fixed resting cell length a2 = 1 while the resting cell length of the left tissue is varied. Analytical solution for the steady-state position of the interface position with given (c) relative cell stiffness and (d) relative resting cell length. (e,f ) Absolute difference between position and steady state for interface position for increasing time for varying (e) relative cell stiffness and (f ) relative resting cell length. (Online version in colour.)